Valves

Ball valves can suffer from abrasion by sand or stone chippings present in fluids and from erosion by accelerating flow when the valve is being closed/opened. Hardide CVD coatings make valve parts scratch-proof and capable of resisting abrasion and erosion. The coating is extremely effective in protecting ball valves from abrasion, erosion from flow acceleration and corrosive chemicals. The binder-free coating gives consistent coating thickness and reduces assembly costs. No matching of seats to valve bodies is required and the coating can be applied easily to internal surfaces and complex shapes enabling greater design flexibility. The smooth and uniform ‘as coated’ finish streamlines finishing operations which are carried out in-house giving faster turnaround times, improved quality control and traceability.

In one example, the coating allows Flowserve to offer Type 316 stainless steel as the base metal for use in severe service applications that require metal-to-metal seating, including abrasive and slurry applications. In the Flowserve slurry tests, Hardide-coated 316 balls and seats remained operational after more than 70,000 cycles in slurry where a Co-Cr wear-resistant failed in 29,000 cycles.

Pumps

Hardide coatings offer pump manufacturers extended component life and enhanced performance in applications where the handling of chemically aggressive or abrasive fluid causes costly loss of production and downtime.

In one application, the coating has delivered a four-fold increase in life in positive displacement pumps handling viscous fluids containing abrasive pigments and fillers. It coats internal surfaces and complex shapes, offers facilitated finishing and reduces wear on packing seals.